Promotion of selectivity to propene in Mg3V2O8 catalysts by oxygen spillover in the oxidative dehydrogenation of propane

Carrazan, SRG;Ruwet, Marie;Ruiz, Patricio;Delmon, Bernard
(1996) Symposium on Catalytic Heterogeneous Hydrocarbon Oxidation, at the 211th National Meeting of the American-Chemical-Society — Location: NEW ORLEANS(La) (24.March.1996)

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  • Carrazan, SRG
    Author
  • Ruwet, MarieUCLouvain
    Author
  • Ruiz, PatricioUCLouvain
    Author
  • Delmon, BernardUCLouvain
    Author
Abstract
The main objective of this work is to demonstrate that spill-over oxygen, Oso, promotes the selectivity to propene on Mg3V2O8 during ODP via a remote control mechanism (RCM). Catalysts were prepared by a) mechanical mixtures of Mg3V2O8+alpha-Sb2O4, b) calcining the mixtures at 873 K for 6 days and and c) by mechanical mixtures of Mg3V2O8+alpha-Mg2V2O7 A detailed physicochemical characterization (BET, XRD, XPS, TEM, AEM) of the solid state properties reveals that neither mutual contamination nor formation of a new phase occurs during catalytic reaction or calcination. alpha-Sb2O4 is inert in the reaction. Significant synergetic effects were observed in the mixtures: Mg3V2O8+alpha-Sb2O4 exhibit an increase of selectivity by suppression of unselective reactions. Mg3V2O8+alpha-Mg2V2O7 mixtures exhibit an increase in the conversion, yield and selectivity and a decrease in the CO2 formation. The role of Oso, which is produced by alpha-Sb2O4, would be that of inhibiting the non-selective sites. Oso is crucial in determining the catalytic properties of the magnesium vanadate catalyst. The existence of a cooperation via Oso between alpha-Mg2V2O7 and Mg3V2O8 could explain the discrepancies observed in the literature concerning the activity and selectivity of the pyre and ortho phases.
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Carrazan, S., Ruwet, M., Ruiz, P., & Delmon, B. (1996). Promotion of selectivity to propene in Mg3V2O8 catalysts by oxygen spillover in the oxidative dehydrogenation of propane. ACS Symposium Series, 638, 223-235. https://doi.org/10.1021/bk-1996-0638.ch016 (Original work published 1996)